[issue12022] improve special method lookup error message

[Benjamin Peterson]

Changes by Benjamin Peterson <benjamin at python.org>:


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resolution: invalid -> 
status: closed -> open
title: 'transaction' module-as-context-manager thwarted by Python 2.7.1 -> improve special method lookup error message

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12022>
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